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Targeting and Localization for Mars Rover Operations

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Targeting and Localization for Mars Rover Operations Targeting and Localization for Mars Rover Operations Mark W. Powell, Thomas Crockett, Jason M. Fox, Joseph C. Joswig, Jeffrey S. Norris, Kenneth J. Rabe, Jet Propulsion Laboratory, Michael McCurdy, NASA Ames Research Center, Guy Pyrzak, San Jose State University Foundation, NASA Ames Research Center, M/S 262-4 Abstract— In this work we discuss how the quality of system can observe the Sun position, it combines that with its localization knowledge impacts the remote operation of rovers knowledge of the expected position of the Sun at a given time on the surface of Mars. We look at the techniques of localization of sol (Martian day) to more accurately refine its estimate of estimation used in the Mars Pathfinder and Mars Exploration vehicle attitude. Visual odometry [2] is a localization Rover missions. We examine the motivation behind the modes technique that has also been proven effective at producing of targeting for different types of activities, such as navigation, remote science, and in situ science. We discuss the virtues and more accurate position and attitude knowledge than shortcomings of existing approaches and new improvements in previously used methods, although it requires significant the latest operations tools used to support the Mars Exploration additional onboard computing time. Rover missions and rover technology development tasks at the Quality of localization knowledge has a direct impact on Jet Propulsion Laboratory. We conclude with future directions how rover activities are planned and refined into commands we plan to explore in improving the localization knowledge for execution on the vehicle. Stereo image pairs returned from available for operations and more effective targeting of rovers and their instrument payloads. the vehicle are correlated into 3D XYZ maps of the visible local terrain around the spacecraft. These XYZ maps are collections of accurate 3D position data used for pointing I. INTRODUCTION science instruments at very specific points of interest, or HIS document describes recent advances in the state of targets. However, as the rover traverses on the surface and T practice of targeting activities in the operation of Mars accumulates error in localization knowledge, these targets rovers. Teleoperation of robotic rovers over a very long become less and less relevant. It is therefore necessary to plan distance such as from Earth to Mars where one-way data activities that refer to any specific targets prior to any driving transfer times vary from 6 to 20 minutes is a challenging activity. The only exceptions to this rule are when a specific problem. Due to this delay, conventional real-time target is not visible to a particular instrument from the teleoperation techniques are not applicable and instead we vehicle’s current position, requiring a drive to bring the target employ onboard vehicle autonomy. Control software on the into the field of view of that instrument. In this case, there are spacecraft can use images from the stereo camera pairs to two mitigating strategies available: either articulating the track landmarks, identify obstacles, and compute a safe instrument in a rastering fashion to increase its effective field traverse path to a location of scientific interest on the surface. of view to compensate for localization error, or acquiring new However, in order to perform these tasks effectively the stereo imagery from the new position, sending it back to vehicle control system must have knowledge of localization Earth and waiting until the next planning cycle (the next sol) (the position and orientation of the vehicle). to command the science accurately. Both of these strategies Several approaches have been used on Mars surface have a cost in onboard execution time and bandwidth, and so vehicles to make localization estimates. During the Mars great care must be taken in operational planning to avoid this Pathfinder mission (MPF) the Sojourner rover used a heading cost whenever possible. sensor and wheel encoder counts to estimate changes in In the next section we discuss how spacecraft activities are position and localization [1]. The Mars Exploration Rovers targeted differently depending on their aims. We also (MER) also uses inertia measurement unit (IMU) and describe how a large group of collaborating scientists who are mobility motor encoder information to estimate position and geographically distributed can effectively define targets for orientation. Further, the Pancam instrument is equipped with operations planning. We then discuss recent improvements Sun filters, and the control software can perform an we have made in the operational processing of defining and autonomous Sun-finding activity. When the vehicle control using targets. Finally, we conclude with a discussion of promising future directions in localization and targeting. The work described in this paper was carried out at the Jet Propulsion II. TARGETING ROVER ACTIVITIES Laboratory, California Institute of Technology and funded by the Mars Technology Program, the JPL Research and Technology Development Program, the Mars Exploration Rover project and the Mars Science A. Coordinate Frame Types Laboratory project. The conventions for coordinate frame descriptions that capture the history of rover positions on the surface come in several types. The frame that describes the rover-centric view 0. As previous discussed, the Local Level frames all share a of the world is called Rover frame. Rover frame is defined as common orientation of X-north, Y-east, Z-nadir while the X-forward, Y-starboard, Z-down with an origin defined at a Rover frame are relative to the orientation of the vehicle at fixed position on the rover body, according to the SAE J670E that position. standard for vehicle coordinate frame. Although not N required, it is advantageous to choose an origin point on a holonomic vehicle (a vehicle that is turn-in-place capable) (4, 0) W E N such that the origin point remains fixed in space as the vehicle (4, 1) turns in place. A related frame to Rover frame is Local Level N S frame, which shares the same origin as Rover frame, but (4, 2) rotates the axes to an orientation of X-north, Y-east, Z-nadir. N This rotation is approximated by the estimated pitch, roll, and yaw of the vehicle, and as such it is subject to error in attitude estimation. Accurate vehicle position estimation after a traverse is well-known as a challenging problem, and because of this a third frame convention was defined for surface operations to compensate for the problem. In the absence of Fig. 1. Coordinate frames used to represent the position localization error, the naïve approach of defining a single and attitude of a 6-wheeled rover. Local Level frames (in world reference frame on the surface of the planet and solid black) are surface-relative and Rover frames (in referencing all subsequent locations on the surface to that dotted red) are vehicle relative. The labels above each frame would be reasonable. In practice where this error does frame denote its Site and Drive indices, respectively, which uniquely identify each frame. exist, this is not a viable approach. To wit, for a relatively distant target—one which represents a medium-to-long term As a labeling mechanism for the history of frames of the goal for navigation—the originally specified XYZ coordinate spacecraft, the control system maintains a Rover Motion of the target becomes increasingly inaccurate the more the Counter. This counter has several integer index values that vehicle traverses on the surface and accumulates more and increase as the vehicle moves. The Drive index is increased more localization error. It is therefore regularly necessary by one every time the vehicle performs a part of a drive, such disregard the history of all vehicle position information to as a turn-in-place or a single segment of an automated date and define a new “world frame”, called Site frame. This traverse with onboard path planning and obstacle avoidance. Site frame then becomes the surface-relative (as opposed to There is also a Site index in the counter which is incremented rover-relative) frame of reference for all operations planning whenever the operations planners need to declare a new Site and targeting. The definition of a Site frame is identical to that to mitigate localization error. When the Site index increases of a Local Level frame, and indeed it is correct to say that a by one, the Drive index is reset to zero and then increases Site frame is a particular Local Level frame that is denoted as with each new drive segment as before. The Rover Motion also being a Site frame. The process for defining which Counter is a useful tool to correlate the telemetry returned frames are Site frames is managed on the ground. In from the vehicle to the position of the vehicle. It is also operations planning, when it is observed that cumulative possible to use image data returned from the spacecraft to localization error has risen to the degree that targeting refine the localization knowledge of the vehicle during accuracy may suffer, a new Site is defined. Another way to operations planning since the frames and images are think of a Site is as a local surface region with the vehicle as correlated by the counter. We will discuss this possibility its center. New Sites may or may not intersect with previous further in Section III.B.1). Sites, depending on how much localization error the rover accumulated during a traverse, which itself depends on B. Navigation Activities factors such as wheel slippage on the soil. Navigating rovers on Mars involves two modes of driving: We can connect all of the Site frames, Local Level frames, commanded and semi-autonomous. Commanded driving is and Rover frames from the landing site of the spacecraft all used when there are enough images available from the the way to the frame at the most recent vehicle position in a spacecraft to assess the topography of the terrain to determine chain.
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